ci: lint+test workflow and Docker skeleton

Author: VenkateswarluNagineni

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+          cache: pip
+
+      - name: Install (core + dev)
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e ".[dev]"
+
+      - name: Lint (ruff)
+        run: ruff check src tests
+
+      - name: Test (pytest)
+        run: pytest --cov=aegis --cov-report=term-missing

Dockerfile

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+# RAG query API image. Geo + AI extras are layered in later phases.
+FROM python:3.11-slim
+
+ENV PYTHONUNBUFFERED=1 \
+    PYTHONDONTWRITEBYTECODE=1
+
+WORKDIR /app
+
+COPY pyproject.toml README.md ./
+COPY src ./src
+
+RUN pip install --no-cache-dir -e ".[serve]"
+
+# Placeholder until the RAG query service lands (roadmap phase 11).
+CMD ["python", "-c", "import aegis; print('aegis', aegis.__version__)"]